Commit a335b33f authored by Xuan Zhuo's avatar Xuan Zhuo Committed by Michael S. Tsirkin
Browse files

virtio_net: support set_ringparam 



Support set_ringparam based on virtio queue reset.

Users can use ethtool -G eth0 <ring_num> to modify the ring size of
virtio-net.

Signed-off-by: default avatarXuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-43-xuanzhuo@linux.alibaba.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent ebcce492

drivers/net/virtio_net.c

+48 −0
Original line number Diff line number Diff line
@@ -2363,6 +2363,53 @@ static void virtnet_get_ringparam(struct net_device *dev, 
	ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);

}



static int virtnet_set_ringparam(struct net_device *dev,

				 struct ethtool_ringparam *ring,

				 struct kernel_ethtool_ringparam *kernel_ring,

				 struct netlink_ext_ack *extack)

{

	struct virtnet_info *vi = netdev_priv(dev);

	u32 rx_pending, tx_pending;

	struct receive_queue *rq;

	struct send_queue *sq;

	int i, err;



	if (ring->rx_mini_pending || ring->rx_jumbo_pending)

		return -EINVAL;



	rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);

	tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);



	if (ring->rx_pending == rx_pending &&

	    ring->tx_pending == tx_pending)

		return 0;



	if (ring->rx_pending > vi->rq[0].vq->num_max)

		return -EINVAL;



	if (ring->tx_pending > vi->sq[0].vq->num_max)

		return -EINVAL;



	for (i = 0; i < vi->max_queue_pairs; i++) {

		rq = vi->rq + i;

		sq = vi->sq + i;



		if (ring->tx_pending != tx_pending) {

			err = virtnet_tx_resize(vi, sq, ring->tx_pending);

			if (err)

				return err;

		}



		if (ring->rx_pending != rx_pending) {

			err = virtnet_rx_resize(vi, rq, ring->rx_pending);

			if (err)

				return err;

		}

	}



	return 0;

}



static bool virtnet_commit_rss_command(struct virtnet_info *vi)

{

	struct net_device *dev = vi->dev;
@@ -2850,6 +2897,7 @@ static const struct ethtool_ops virtnet_ethtool_ops = { 
	.get_drvinfo = virtnet_get_drvinfo,

	.get_link = ethtool_op_get_link,

	.get_ringparam = virtnet_get_ringparam,

	.set_ringparam = virtnet_set_ringparam,

	.get_strings = virtnet_get_strings,

	.get_sset_count = virtnet_get_sset_count,

	.get_ethtool_stats = virtnet_get_ethtool_stats,